News

The Carnegie Supernova Project has released its third and final set of type Ia supernova photometry.  In total, 134 type Ia supernovae are included. This release supersedes our previous two data releases (DR1 and DR2). The details of the data release are described in Krisciunas et al. (2017).  The data reduction pipeline has been improved, particularly in the NIR. Photometry, filter functions and zero-points can be obtained here. 

Our final data release of CSPI is eminent. Along the way, we have made several improvements to the filters, most notably using an airmass of 1.2 when applying the atmospheric corrections. This more closely matches the median airmass of our photometric standard observations. Also, we have improved color terms, which will change the derived zero-points. The latest package can be downloaded from here.

If you already have SNooPy running and you used the bootstrap script to install it, all you need to do us run the update-snpy script:

/location/of/snpy/bin/update-snpy

Otherwise, download the latest version and install it over the older version.

The Carnegie Supernova Project has released its first set of type Ia supernova spectroscopy.  In all, spectra of 93 type Ia supernovae are included in this release.  The details of the data release are described in Folatelli et al. (2013).  You can download the entire set of spectra from this link. You can also browse the spectra individually by going here.

Thanks to a group of Texas A & M astronomers including Jean-Philippe Rheault, Jennifer Marshall, Darren Depoy, and Steven Villanueva, three of the CSP filter functions in the NIR, Y-, J-, and H-band, have been accurately scanned.  These filter functions represent the throughput of all optical components of the telescope, dewars, and filters.  Empirical functions for the atmospheric absorption are then incorporated to produce the final functions.  All CSP filter, including these new scans, can be found here.

The Carnegie Supernova Project has released its second set of type Ia supernova photometry.  Together with data release 1, this brings the total number of type Ia's to 83, most with optical and NIR coverage.  The details of the data release are described in Stritzinger et al. (2011).  One major improvement over the previous data release is the inclusion of improved filter+telescope+atmosphere functions that should allow more precise S-corrections between different photometric systems.  Photometry, filter functions and zero-points can be obtained here.

Using its observations of the Type Ia supernova SN2007sr, the CSP has determined a new distance to the interacting galaxies NGC 4038/NGC 4039 (aka the Antennae). This new distance of approximately 22 ± 3 Mpc is in agreement with flow models (assuming H_o = 72 km/s/Mpc). However, it is in stark disagreement with recent TRGB distance estimates by Saviane et. al (2008) of 13.3 ± 1 Mpc. As discussed in their paper, Schweitzer et. al (2008), this is likely due to a misidentification of the TRGB. A re-analysis of the HST data used by Saviane et. al (2008) yields a more concordant distance of 20 ± 2 Mpc.

The Carnegie Supernova Project has developed an analysis package, written in python, called SNooPy.  It's fundamental use is for fitting TypeIa supernova light-curves using template derived from the CSP uBVgriYJH photometry.  SNooPy can therefore determine distances to SNeIa using any combination of these filters.  More generally, SNooPy includes tools for computing S- and K-corrections, determining galactic extinction, producing synthetic photometry based on filter responses and spectral energy distributions, and general-purpose curve fitting.  The code is available for download here.

The first 35 SNIa from the low-redshift sample have been published on the CSP's website.  Simply visit the CSP Data page and browse the list of published supernovae.  You can download the data SN by SN, or get all of them at once (by clicking on the "download" button).